Naruto: I start with one door, and I can open it infinitely.

The next day.

When Lin Chuan woke up and saw the familiar wooden roof, he couldn't help but breathe a sigh of relief. At least he was no longer in a cave in the wild, nor was he in the cold floorboards at the base. He remembered correctly; he had finally come out of the base.

After a quick wash, he went to the kitchen for breakfast and happened to see his adoptive father and Maruhoshi Kosuke drinking tea in the backyard.

"Xiaochuan is awake? Go have breakfast first, then come over. We have something to tell you," Lin Chuan's father waved his hand gently and continued to drink tea with Maruhoshi Kosuke, discussing some upcoming details.

Lin Chuan breathed a sigh of relief when he saw that Maruboshi Kosuke was also there. He had thought that Danzo would launch a night attack, but it seemed that Maruboshi Kosuke hadn't left last night, so he was relieved.

After breakfast, he went to the backyard and sat in the middle of the tea table to pour tea for his adoptive father and Maruhoshi Kosuke.

"Xiao Chuan, we know about your experiences at Root, so let's not talk about it anymore," Lin Chuan's father put down his teacup, a look of relief on his face, and said in a low voice, "From now on, I hope you can train with Senior Kosuke and become stronger as soon as possible..."

"That suits me perfectly, Father, Grandpa Kosuke," Lin Chuan finally smiled, his face no longer as cold as yesterday. Now that there were no outsiders present, he directly called him Grandpa Kosuke.

"Good boy, it was Grandpa's oversight before. You've worked hard," Maruhoshi Kosuke said, still feeling a bit guilty. If he had discovered Lin Chuan's visit to Root earlier, he could have brought Lin Chuan out sooner.

However, it's not too late now. There's still time to salvage the situation. He won't blame himself or feel guilty for the rest of his life because of one thing. He has completely moved on.

In order to prevent the tragedy from repeating itself, he will arm Lin Chuan and turn him into a powerful ninja, powerful enough to protect him from the wind and rain.

"Grandpa Kosuke, it's not your fault. Lord Danzo collected many talented ninja children, and I was just one of them." Lin Chuan thought of Sai and Shin. He had only met the two of them a few times, and he could only describe their future as hopeless, because the Root's graduation test was to kill their own comrades.

"Alright, let's talk about our trip first. Get ready and come with me. We won't be back for a long time this time..."

"How long will it take?" Lin Chuan hadn't forgotten the ninja academy; there was still a brat waiting for him there.

"The Ninja Academy's winter break is approaching, about two weeks away. Your winter break is two months long, so let's find a warm place to train properly," Maruhoshi Kosuke planned to use this time to give Lin Chuan special training without affecting his schooling.

As for why Lin Chuan, who is already so strong, would still go to the Ninja Academy instead of directly applying for graduation.

I talked with Lin Chuan's father for a long time last night, and we discussed it again this morning. They finally finalized the plan: going to school is a must.

It's not the time of the Ninja War now, so Konoha isn't in such a shortage of new ninjas. Besides, going to school isn't just about studying; it's also about making friends.

If Lin Chuan graduates now, many of his peers will drift away, which is very detrimental to a child's development.

In particular, there are many children of ninja clan leaders in Lin Chuan's class. Building good relationships with these future ninja clan leaders will be more beneficial than harmful to Lin Chuan in the future.

If we don't build a deep enough bond with these kids during their school years, it won't be so easy to have such a simple relationship like we had in our childhood in the future.

So they decided together to let Lin Chuan continue his studies, complete his six years of learning at the Ninja Academy, and become a real ninja.

"Let's go, Grandpa Kosuke, I'm all packed." Lin Chuan slung a backpack over his shoulder, which contained a few sets of simple clothes to change into, as well as some personal items. He then left with Maruhoshi Kosuke.

Their departure went unnoticed, and they didn't leave through the gates of Konoha Village. Maruboshi Kosuke had already informed Hiruzen Sarutobi, and their departure was so quiet that even Danzo was unaware of it.

It was more than a month later when Danzo learned of their disappearance...

……

at the same time--

Lin Chuan and Maruhoshi Kosuke have arrived at a small coastal town in the southern part of the Land of Fire and have settled down here temporarily.

Since both of them were Water Release ninjas, the seaside environment was perfect for them, and the power of their Water Release techniques was amplified by the environment, giving them an unprecedented sense of comfort.

"Ogawa, apart from insufficient chakra and some shortcomings in taijutsu, swordsmanship, and actual combat, you have already reached the level of a Chunin in other aspects," Maruboshi Kosuke said, putting away his short sword. He had just fought Lin Chuan using taijutsu and had figured out Lin Chuan's weaknesses.

"Next, all you need to do is make up for your weaknesses in taijutsu, swordsmanship, and combat. With your age increasing, becoming a Chunin won't be difficult for you..."

"I understand, Grandpa Kosuke," Lin Chuan also put away his short sword, which was the same ninja tool he had brought with him from Root.

"Now try your ninjutsu? Attack me with the ninjutsu you've learned," Maruboshi Kosuke said, unarmed. He was confident in Lin Chuan's ninjutsu, since Lin Chuan had already mastered the Shadow Clone Technique and could unleash two B-rank ninjutsu at once, so his proficiency in ninjutsu was sufficient.

"Grandpa Kosuke, why don't you try the defensive power of my water ball?" Lin Chuan slowly formed a hand seal, opened his mouth and spat out a stream of water in front of him, forming a water ball that gradually enveloped him.

"This is... the Water Prison Technique?" Maruboshi Kosuke saw the hand seals and immediately guessed what kind of ninjutsu it was, since he also knew this ninjutsu. He then raised his fist and attacked.

However, after his fist passed through the water sphere, it encountered a great deal of resistance, and because he did not use his full strength, his punch could not penetrate the water sphere.

However, when Lin Chuan saw Maruboshi Kosuke reach into the water sphere, he grabbed Maruboshi Kosuke's fist and pulled him forward with the water sphere, trapping Maruboshi Kosuke inside.

"Hehe, aren't you trapping yourself like this?" Maruhoshi Kosuke sat in the water sphere, looking at Lin Chuan speechlessly.

"Grandpa Kosuke, you guessed wrong," Lin Chuan inside the water sphere revealed a meaningful smile, instantly transforming into a stream of water that enveloped Maruhoshi Kosuke.

When Maruboshi Kosuke saw Lin Chuan's body collapse, he realized he had fallen into a trap. He quickly held his breath and looked outside the water sphere, where another Lin Chuan was channeling chakra into it.

Lin Chuan smiled outside the water sphere and shouted loudly to Maruhoshi Kosuke, "Grandpa Kosuke, try to see if you can break this water sphere..."

"Okay," Maruhoshi Kosuke was about to nod when he found that he couldn't move at all, not even his fingers. After holding on for more than 30 seconds, he was starting to feel suffocated.

Seeing that Maruhoshi Kosuke was suffocating, Lin Chuan released the water prison spell and helped Maruhoshi Kosuke up from the water: "Grandpa Kosuke, are you alright?"

"Ogawa, I'm fine. Your move was very good, but it can only be used once. However, once is enough." Maruboshi Kosuke and Lin Chuan arrived at the beach, and Maruboshi Kosuke then asked, "You want to turn this move into a ninjutsu that can be used for defense and to trap people, right?"

"Haha, nothing can be hidden from Grandpa Kosuke," Lin Chuan laughed awkwardly, gathered some dry firewood to start a fire, and warmed Maruhoshi Kosuke.

"A very good idea. Passive defense can attract enemies to attack you, allowing you to trap them. Your water clones then transform into water currents to fill the water sphere, causing enemies to suffocate and die faster than the original water prison technique..."

"If the enemy is careless, two C-rank ninjutsu can take down an enemy of my strength. This combination ninjutsu already has practical value in combat," Maruboshi Kosuke commented on Lin Chuan's combination ninjutsu with his years of experience, and then changed the subject.

"However, your ninjutsu isn't without its weaknesses. The enemy will definitely be on guard if you use it a second time, but you should mainly use it for defense, so that's not a problem..."

"If the enemy uses chakra to attach to the ground or water, it will be difficult for you to move them. However, you already have a solution: if the enemy doesn't move, you actively envelop them with the water sphere..."

"There's another fatal weakness. You must make sure you're targeting the right person. The one pulled into the water sphere must be your main body. Otherwise, your main body won't be able to move, and you'll be completely at their mercy..."

"Grandpa Kosuke, if I calculate the amount of chakra and use my water clone to maintain this water prison until a ninja suffocates to death, then my main body can continue to hide. Wouldn't that solve the problem?" Lin Chuan immediately thought of a solution.

If there is water in the environment, it is easy to summon a water clone. If that doesn't work, you can use a shadow clone. In short, the main body must not take any risks to maintain the water prison.

"It's good that you have a solution. In short, never reveal your true form before the enemy's trump card is exposed," Maruboshi Kosuke smiled with relief. He thought that Lin Chuan would become arrogant because of the combination ninjutsu and because of his praise, thus becoming complacent and giving the enemy an opportunity.

Hearing that this kid valued his life even more than he did, he felt relieved and continued, "Judging from your understanding of these two water-style combination ninjutsu, you are already quite proficient in water-style ninjutsu. If you don't understand anything, come and ask me. Over the next two months, I will help you fill in the gaps in your taijutsu, swordsmanship, and combat experience..."

"From now on, every day, no matter when or what, you must attack me with all your might. You can't use ninjutsu, only kunai and short swords, except when you're sleeping," Maruboshi Kosuke smiled and explained to Lin Chuan. "Don't worry about hurting me, just attack with all your might, or you'll get beaten up..."

"Oh, I understand," Lin Chuan knew this was him, and the next two months of practical training would follow.

"Oh, what? Going back?" Maruhoshi Kosuke kicked up sand to extinguish the fire, then smiled at Lin Chuan who had followed him, "Little Chuan, if you can hurt Grandpa, Grandpa will teach you a powerful Konoha-style sword technique..."

"Really?" Lin Chuan could roughly guess what kind of sword technique it was; it should be that illusion sword technique.

"Of course it's true. When has Grandpa ever lied to you? Hahaha..."

……

Two months later...

Konoha Village, the main gate.

"Hahaha, we're finally back!" Lin Chuan and Maruhoshi Kosuke stood at the gate of Konoha Village and couldn't help but burst into laughter.

They've only been away for a little over two months, but they've gotten quite tanned at the beach, grown taller, and become much stronger.

After all, he had been pushed hard for the past two months. His ninjutsu hadn't improved much, but his taijutsu, swordsmanship, and combat skills had improved by leaps and bounds. After all, it was special combat training, so it would be hard not to improve.

Just thinking about these past two months is enough to bring tears to my eyes. Sometimes, when Maruhoshi Kosuke hit too hard, I would be beaten until my skin was torn and bleeding all over, with no good spot left. Before the wounds had even healed, new wounds would appear. It was truly a painful yet pleasurable experience.

With the Ninja Academy about to start, he and Maruboshi Kosuke rushed from a small coastal town in the southern part of the Land of Fire to Konoha.

"You go home first, I'll go find the Hokage to hand over the mission," Maruboshi Kosuke said, looking at Konoha right in front of him. He wasn't worried that Lin Chuan would get into trouble, since only Danzo would care about Lin Chuan, and if Lin Chuan got into trouble, it would definitely be related to Danzo.

"Okay, Grandpa Kosuke," Lin Chuan excitedly rushed into Konoha. Maruhoshi Kosuke would handle the entry procedures, while the exit procedures would naturally be a secret mission.

When Lin Chuan returned home, his parents noticed that he had become much darker. Lin Chuan's mother felt sorry for the hardships he had endured during this time, while Lin Chuan's father's eyes lit up. This was a necessary process for becoming stronger.

"Xiao Chuan, why didn't Senior Kosuke come back with you?" Lin Chuan's father put down his newspaper and asked.

"We came together. Grandpa Kosuke is going to the Hokage Tower to hand over his mission, so I went home first," Lin Chuan explained, then couldn't help but look at the two of them and ask, "Mother, I'm so hungry, is there anything to eat...?"

"Yes, yes, yes, I'll go make you some food right away," Lin Chuan's mother said with a smile as she turned and left, leaving the father and son alone.

"Dad, I need to go to the backyard to see my crows. Have you taken good care of them while I've been away for the past two months?" Lin Chuan rushed straight to the backyard, as the crows were related to his psychic abilities.

"Your mother is feeding them, don't worry," Lin Chuan's father followed him into the backyard. Looking at the flock of crows that built nests in the tree branches and cawed every night, he really had a headache.

He had wanted to chase away the flock of crows for a long time, but his son said he wanted to use them as summoning beasts, so he had no choice but to let them cackle. After all, he couldn't afford any other summoning beasts, and feeding the crows would save him the money he would have spent on buying them.

Watching his son feed the crows, it was almost dinnertime, so he took his son back to the kitchen to eat dinner together and asked about his cultivation over the past two months.

Upon learning that Maruboshi Kosuke had helped his son overcome his shortcomings, he thought to himself that he should find some time to have a drink with Maruboshi Kosuke and properly thank the senior Kosuke.

After all, they had to thank the other party for their son's ability to emerge from the root. Last time, because Lin Chuan was in a coma and they had to go out to cultivate the next day, they didn't have time to properly thank Senior Gu Jie. They couldn't be negligent this time.

After dinner, before Lin Chuan went to bed, he told Lin Chuan, "Your mother has made your bed. Tomorrow is the first day of the Ninja Academy. I've already registered you. Just go straight to school..."

"Alright, Dad, I'm going to sleep now," Lin Chuan yawned. Traveling was really tiring. Running hundreds of kilometers a day was something only a ninja could handle. An ordinary person would probably be exhausted.